<template>
  <div>
    <!-- 面包屑  -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!--  卡片视图  -->
    <el-card class="box-card">
      <!--  提示栏  -->
      <el-alert type="info" title="添加商品信息" center show-icon :closable="false"></el-alert>
      <!--  步骤条  -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!--  tab栏区域  -->
      <el-form :model="addGoodsForm" :rules="addGoodsRules" ref="addGoodsRef"
               label-position="top" label-width="100px">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave"
                 @tab-click="tabClick">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addGoodsForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addGoodsForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addGoodsForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addGoodsForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addGoodsForm.goods_cat"
                :options="cateList"
                :props="cascaderProps"
                @change="cateChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item v-for="item in manyTableData" :key="item.attr_id" :label="item.attr_name">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox v-for="(value, i) in item.attr_vals" :key="i" :label="value" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item v-for="item in onlyTableData" :key="item.attr_id" :label="item.attr_name">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :headers="headerObj"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              :on-success="handleSuccess"
              list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addGoodsForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="add-goods" @click="addGoods">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
  import _ from 'lodash'
  export default {
    name: 'Add',
    data() {
      return {
        // 当前的步骤
        activeIndex: '0',
        // 添加商品的表单数据对象
        addGoodsForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          // 商品分类数组
          goods_cat: [],
          // 上传图片数组
          pics: [],
          // 商品内容
          goods_introduce: '',
          // 动态参数和静态属性对应数据
          attrs: []
        },
        // 添加商品表单验证规则对象
        addGoodsRules: {
          goods_name: [
            { required: true, message: '请输入商品名称', trigger: 'blur' }
          ],
          goods_price: [
            { required: true, message: '请输入商品价格', trigger: 'blur' }
          ],
          goods_weight: [
            { required: true, message: '请输入商品重量', trigger: 'blur' }
          ],
          goods_number: [
            { required: true, message: '请输入商品数量', trigger: 'blur' }
          ],
          goods_cate: [
            { required: true, message: '请选择商品分类', trigger: 'blur' }
          ]
        },
        // 商品分类
        cateList: [],
        // 商品分类级联选择框配置
        cascaderProps: {
          expandTrigger: 'hover',
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        // 动态参数列表数组
        manyTableData: [],
        // 静态属性列表
        onlyTableData: [],
        // 图片上传组件对应的文件请求头
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        // 需要预览的图片地址
        previewPath: '',
        // 预览图片窗口是否显示
        previewVisible: false
      }
    },
    created () {
      this.getCateList()
    },
    methods: {
      // 商品分类数据获取
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) return this.$message.error('获取商品分类失败！')
        this.cateList = res.data
      },
      // 商品分类选中事件
      cateChange() {
        // 当选中的不是3级分类时，清空选中的数组
        if (this.addGoodsForm.goods_cat.length !== 3) {
          this.addGoodsForm.goods_cat = []
          this.$message.warning('只能选择三级分类！')
        }
      },
      // tab切换前的函数
      beforeTabLeave(activeName, oldActiveName) {
        if (oldActiveName === '0' && this.addGoodsForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类！')
          return false
        }
      },
      // tab点击事件
      async tabClick() {
        // 选中的是动态参数tab
        if (this.activeIndex === '1') {
          const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
          if (res.meta.status !== 200) return this.$message.error('获取动态参数失败！')
          res.data.forEach(val => {
            val.attr_vals = val.attr_vals.split(',')
          })
          this.manyTableData = res.data
        } else if (this.activeIndex === '2') {
          const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
          if (res.meta.status !== 200) return this.$message.error('获取静态属性失败！')
          res.data.forEach(val => {
            val.attr_vals = val.attr_vals.split(',')
          })
          this.onlyTableData = res.data
          this.onlyTableData.forEach(item => {
            if (Array.isArray(item.attr_vals)) {
              item.attr_vals = item.attr_vals.join(',')
            }
          })
        }
      },
      // 图片预览事件
      handlePreview(file) {
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      // 图片删除事件
      handleRemove(file) {
        const filePath = file.response.data.tmp_path
        const i = this.addGoodsForm.pics.findIndex(x => x.pic === filePath)
        this.addGoodsForm.pics.splice(i, 1)
      },
      // 图片上传成功
      handleSuccess(response) {
        const picInfo = { pic: response.data.tmp_path }
        this.addGoodsForm.pics.push(picInfo)
      },
      addGoods() {
        this.$refs.addGoodsRef.validate(async valid => {
          if (!valid) return this.$message.error('请填写必要的表单项！')
          const goods = _.cloneDeep(this.addGoodsForm)
          goods.goods_cat = goods.goods_cat.join(',')
          this.manyTableData.forEach(item => {
            const info = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
            goods.attrs.push(info)
          })
          this.onlyTableData.forEach(item => {
            const info = { attr_id: item.attr_id, attr_value: item.attr_vals }
            goods.attrs.push(info)
          })
          // 调用添加商品接口
          const { data: res } = await this.$http.post('goods', goods)
          if (res.meta.status !== 201) return this.$message.error('添加商品失败！')
          // 添加成功处理
          this.$message.success('添加商品成功！')
          this.$router.push('/goods')
        })
      }
    },
    computed: {
      cateId() {
        if (this.addGoodsForm.goods_cat.length === 3) {
          return this.addGoodsForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style lang="less" scoped>
  .el-checkbox {
    margin: 0 10px 0 0 !important;
  }
  .previewImg {
    width: 100%;
  }
  .add-goods {
    margin-top: 15px;
  }
</style>
